| abstract |
A nanoparticle fluorescent material of metal oxide or metal sulfide which is surface modified by a surface modification agent, wherein a half width of emission spectrum is 50 to 200 nm, and the surface modification agent is a compound represented by formula (I) or a degradation product thereof, and a dispersion of the same. n nM-(R) 4 formula (I) nIn formula (I), M is an Si or Ti atom, and R is an organic group. The R groups may be the same or different from each other, but at least one R group is a group having reactivity with an affinity molecule. |